Patents by Inventor Darrell D. Gronli

Darrell D. Gronli has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Crimp seal pleated filter assembly
    Patent number: 4617122
    Abstract: A crimp seal pleated filter assembly having a base (20), a frame (40) and a filter media (60), including a plurality of pleats (66). When assembled, the pleats (66) of the filter media (60) are uniformly aligned within the assembly 10 and are secured therein by crimp sealing the filter media ends (62) between interlocking projections (30) 50 on the sides (23) of the base (20) and side walls 43 of the frame. Outboard end flaps (68) of the filter are crimp sealed and encapsulated between side blades (26) of the frame (20) and the front wall (42) and back wall (44) of the frame, minimizing flaking or chafing of fibers from the filter (60).
    Type: Grant
    Filed: August 1, 1984
    Date of Patent: October 14, 1986
    Assignee: Donaldson Company, Inc.
    Inventors: Barbara L. Kruse, Darrell D. Gronli, Donald D. Gronholz